Arpeggio of Blue Steel (Volume 7)

Having joined Gunzou and the 401's side in the struggle between humanity and the Fog, Takao is eager to prove her worth - and her strength and experience are about to be put to the test! REmotely operating the fake "401" taken by Japan's military is no small task, even for her, and the human-crewed U-boat 2501, captained by Zordan, is all too eager to take Takao down.

Gunzou and his crew are faced with a painful decision: go to their new ally's aid, or seize the opening to get their mission to the U.S. properly underway? But help comes from an unexpected source . . .